Small things like helping You get ready for a date or kissing Your shoes when You return are symbolic and helps the slave focus on what his purpose is -to serve You. Having him bathe You then pick out sexy outfits for You to wear to seduce another man can be quite a turn-on. So can locking him into chastity and wearing his keys around Your neck while You are brought to orgasm after orgasm by another man. Further his cuckolding experience by making him wish You great sex before You leave.
While You are out he will be filled with mixed feelings that may surface while You detail to him all of the dirty, exciting things You did with other better and larger endowed men. But a good slave will put his own feelings aside and obediently lick his Mistress's shoes while You rave about You're lover's sexual expertise. If the night has gone well You may choose to gag the slave with Your cum-soaked panties while he caressingly massages Your exhausted body. Shoving his face between Your legs so he can smell Your lover's intoxicating scent is a reward that should only be given to the best of slaves. If he is particularly deserving I would allow him to lick up all Your lovers' cum from deep inside Your pussy. Let him see how much You enjoyed fucking other men while he was left at home with his useless little dick completely locked up!
Being confined to chastity and listening to You dreamily recount a night of complete sexual satisfaction, something unavailable to him, forces Your little cuckold to accept he is only Your slave and not a real lover.